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expand system executors

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Slavomir
2020-04-01 15:12:48 +03:00
parent 1c40d6c1ce
commit 33c18b0d11
14 changed files with 625 additions and 3 deletions
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177
ql/src/semmle/go/frameworks/SystemCommandExecutors.qll
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@@ -5,6 +5,19 @@
import go
/**
* An indirect system-command execution via an argument argument passed to a command interpreter
* such as a shell, `sudo`, or a programming-language interpreter.
*/
private class ShellOrSudoExecution extends SystemCommandExecution::Range, DataFlow::CallNode {
ShellOrSudoExecution() {
this instanceof SystemCommandExecution and
this.getAnArgument().getAPredecessor*() instanceof ShellLike
}
override DataFlow::Node getCommandName() { result = getAnArgument() }
}
private class SystemCommandExecutors extends SystemCommandExecution::Range, DataFlow::CallNode {
int cmdArg;
@@ -23,13 +36,171 @@ private class SystemCommandExecutors extends SystemCommandExecution::Range, Data
}
/**
* A call to the `Command` function from the [go-sh](https://github.com/codeskyblue/go-sh)
* package, viewed as a system-command execution.
* A call to the `Command` function, or `Call` or `Command` methods on a `Session` object
* from the [go-sh](https://github.com/codeskyblue/go-sh) package, viewed as a
* system-command execution.
*/
private class GoShCommandExecution extends SystemCommandExecution::Range, DataFlow::CallNode {
GoShCommandExecution() {
getTarget().hasQualifiedName("github.com/codeskyblue/go-sh", "Command")
exists(string packagePath | packagePath = "github.com/codeskyblue/go-sh" |
// Catch method calls on the `Session` object:
exists(Method method |
method.hasQualifiedName(packagePath, "Session", "Call")
or
method.hasQualifiedName(packagePath, "Session", "Command")
or
method.hasQualifiedName(packagePath, "Session", "Exec")
|
this = method.getACall()
)
or
// Catch calls to the `Command` function:
getTarget().hasQualifiedName(packagePath, "Command")
)
}
override DataFlow::Node getCommandName() { result = this.getArgument(0) }
}
/**
* A call to a method on a `Session` object from the [ssh](golang.org/x/crypto/ssh)
* package, viewed as a system-command execution.
*/
private class SshCommandExecution extends SystemCommandExecution::Range, DataFlow::CallNode {
SshCommandExecution() {
// Catch method calls on the `Session` object:
exists(Method method, string methodName |
methodName = "CombinedOutput"
or
methodName = "Output"
or
methodName = "Run"
or
methodName = "Start"
|
method.hasQualifiedName("golang.org/x/crypto/ssh", "Session", methodName) and
this = method.getACall()
)
}
override DataFlow::Node getCommandName() { result = this.getArgument(0) }
}
/**
* A data-flow node whose string value might refer to a command that interprets (some of)
* its arguments as commands.
*
* Examples include shells, `sudo`, programming-language interpreters, and SSH clients.
*/
private class ShellLike extends DataFlow::Node {
ShellLike() {
isSudoOrSimilar(this) or
isShell(this) or
isProgrammingLanguageCli(this) or
isSsh(this)
}
}
private string getASudoCommand() {
result = "sudo" or
result = "su" or
result = "doas" or
result = "access" or
result = "vsys" or
result = "userv" or
result = "sus" or
result = "super" or
result = "priv" or
result = "calife" or
result = "ssu" or
result = "su1" or
result = "op" or
result = "sudowin" or
result = "sudown"
}
/**
* A data-flow node whose string value might refer to a command that interprets (some of)
* its arguments as system commands in a similar manner to `sudo`.
*/
private predicate isSudoOrSimilar(DataFlow::Node node) {
exists(string regex |
regex = ".*(^|/)(" + concat(string cmd | cmd = getASudoCommand() | cmd, "|") + ")"
|
node.getStringValue().regexpMatch(regex)
)
}
private string getAShellCommand() {
result = "bash" or
result = "sh" or
result = "rbash" or
result = "dash" or
result = "zsh" or
result = "csh" or
result = "tcsh" or
result = "fish" or
result = "pwsh" or
result = "elvish" or
result = "oh" or
result = "ion" or
result = "ksh" or
result = "rksh" or
result = "tksh" or
result = "mksh" or
result = "nu" or
result = "oksh" or
result = "osh" or
result = "shpp" or
result = "xiki" or
result = "xonsh" or
result = "yash"
}
/**
* A data-flow node whose string value might refer to a shell.
*/
private predicate isShell(DataFlow::Node node) {
exists(string regex |
regex = ".*(^|/)(" + concat(string cmd | cmd = getAShellCommand() | cmd, "|") + ")"
|
node.getStringValue().regexpMatch(regex)
)
}
private string getAnInterpreterName() {
result = "python" or
result = "php" or
result = "ruby" or
result = "perl" or
result = "node" or
result = "nodejs"
}
/**
* A data-flow node whose string value might refer to a programming-language interpreter.
*/
private predicate isProgrammingLanguageCli(DataFlow::Node node) {
// NOTE: we can encounter cases like /usr/bin/python3.1 or python3.7m
exists(string regex |
regex =
".*(^|/)(" + concat(string cmd | cmd = getAnInterpreterName() | cmd + "[\\d.\\-vm]*", "|") +
")"
|
node.getStringValue().regexpMatch(regex)
)
}
private string getASshCommand() { result = "ssh" or result = "putty.exe" or result = "kitty.exe" }
/**
* A data-flow node whose string value might refer to an SSH client or similar, whose arguments can be
* commands that will be executed on the remote host.
*/
private predicate isSsh(DataFlow::Node node) {
exists(string regex |
regex = ".*(^|/)(" + concat(string cmd | cmd = getASshCommand() | cmd, "|") + ")"
|
node.getStringValue().regexpMatch(regex)
)
}

55
ql/test/library-tests/semmle/go/frameworks/SystemCommandExecutors/SystemCommandExecutors.expected Normal file
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@@ -0,0 +1,55 @@
| SystemCommandExecutors.go:26:3:26:36 | call to StartProcess | SystemCommandExecutors.go:26:19:26:24 | source |
| SystemCommandExecutors.go:30:3:30:47 | call to StartProcess | SystemCommandExecutors.go:30:19:30:23 | shell |
| SystemCommandExecutors.go:30:3:30:47 | call to StartProcess | SystemCommandExecutors.go:30:26:30:41 | composite literal |
| SystemCommandExecutors.go:30:3:30:47 | call to StartProcess | SystemCommandExecutors.go:30:44:30:46 | nil |
| SystemCommandExecutors.go:33:3:33:64 | call to StartProcess | SystemCommandExecutors.go:33:19:33:23 | shell |
| SystemCommandExecutors.go:33:3:33:64 | call to StartProcess | SystemCommandExecutors.go:33:26:33:58 | call to append |
| SystemCommandExecutors.go:33:3:33:64 | call to StartProcess | SystemCommandExecutors.go:33:61:33:63 | nil |
| SystemCommandExecutors.go:36:3:36:61 | call to StartProcess | SystemCommandExecutors.go:36:19:36:23 | shell |
| SystemCommandExecutors.go:36:3:36:61 | call to StartProcess | SystemCommandExecutors.go:36:26:36:55 | call to append |
| SystemCommandExecutors.go:36:3:36:61 | call to StartProcess | SystemCommandExecutors.go:36:58:36:60 | nil |
| SystemCommandExecutors.go:44:3:44:57 | call to StartProcess | SystemCommandExecutors.go:44:19:44:33 | assumedNonShell |
| SystemCommandExecutors.go:47:3:47:74 | call to StartProcess | SystemCommandExecutors.go:47:19:47:33 | assumedNonShell |
| SystemCommandExecutors.go:50:3:50:82 | call to StartProcess | SystemCommandExecutors.go:50:19:50:33 | assumedNonShell |
| SystemCommandExecutors.go:56:3:56:31 | call to Command | SystemCommandExecutors.go:56:16:56:21 | source |
| SystemCommandExecutors.go:59:3:59:41 | call to Command | SystemCommandExecutors.go:59:16:59:20 | shell |
| SystemCommandExecutors.go:59:3:59:41 | call to Command | SystemCommandExecutors.go:59:23:59:26 | "a0" |
| SystemCommandExecutors.go:59:3:59:41 | call to Command | SystemCommandExecutors.go:59:29:59:32 | "a1" |
| SystemCommandExecutors.go:59:3:59:41 | call to Command | SystemCommandExecutors.go:59:35:59:40 | source |
| SystemCommandExecutors.go:62:3:62:56 | call to Command | SystemCommandExecutors.go:62:16:62:20 | shell |
| SystemCommandExecutors.go:62:3:62:56 | call to Command | SystemCommandExecutors.go:62:23:62:52 | call to append |
| SystemCommandExecutors.go:65:3:65:114 | call to Command | SystemCommandExecutors.go:65:16:65:19 | "sh" |
| SystemCommandExecutors.go:65:3:65:114 | call to Command | SystemCommandExecutors.go:65:22:65:25 | "-c" |
| SystemCommandExecutors.go:65:3:65:114 | call to Command | SystemCommandExecutors.go:65:28:65:113 | ...+... |
| SystemCommandExecutors.go:66:3:66:42 | call to Command | SystemCommandExecutors.go:66:16:66:21 | "sudo" |
| SystemCommandExecutors.go:66:3:66:42 | call to Command | SystemCommandExecutors.go:66:24:66:27 | "sh" |
| SystemCommandExecutors.go:66:3:66:42 | call to Command | SystemCommandExecutors.go:66:30:66:33 | "-c" |
| SystemCommandExecutors.go:66:3:66:42 | call to Command | SystemCommandExecutors.go:66:36:66:41 | source |
| SystemCommandExecutors.go:69:3:69:68 | call to Command | SystemCommandExecutors.go:69:16:69:21 | "ruby" |
| SystemCommandExecutors.go:69:3:69:68 | call to Command | SystemCommandExecutors.go:69:24:69:27 | "-e" |
| SystemCommandExecutors.go:69:3:69:68 | call to Command | SystemCommandExecutors.go:69:30:69:67 | call to Sprintf |
| SystemCommandExecutors.go:70:3:70:80 | call to Command | SystemCommandExecutors.go:70:16:70:21 | "perl" |
| SystemCommandExecutors.go:70:3:70:80 | call to Command | SystemCommandExecutors.go:70:24:70:27 | "-e" |
| SystemCommandExecutors.go:70:3:70:80 | call to Command | SystemCommandExecutors.go:70:30:70:79 | call to Sprintf |
| SystemCommandExecutors.go:71:3:71:86 | call to Command | SystemCommandExecutors.go:71:16:71:26 | "python2.7" |
| SystemCommandExecutors.go:71:3:71:86 | call to Command | SystemCommandExecutors.go:71:29:71:32 | "-c" |
| SystemCommandExecutors.go:71:3:71:86 | call to Command | SystemCommandExecutors.go:71:35:71:85 | call to Sprintf |
| SystemCommandExecutors.go:72:3:72:87 | call to Command | SystemCommandExecutors.go:72:16:72:27 | "python3.6m" |
| SystemCommandExecutors.go:72:3:72:87 | call to Command | SystemCommandExecutors.go:72:30:72:33 | "-c" |
| SystemCommandExecutors.go:72:3:72:87 | call to Command | SystemCommandExecutors.go:72:36:72:86 | call to Sprintf |
| SystemCommandExecutors.go:74:3:74:56 | call to Command | SystemCommandExecutors.go:74:16:74:33 | "python3.7-config" |
| SystemCommandExecutors.go:75:3:75:44 | call to Command | SystemCommandExecutors.go:75:16:75:28 | "python3-pbr" |
| SystemCommandExecutors.go:78:3:78:56 | call to Command | SystemCommandExecutors.go:78:16:78:20 | "ssh" |
| SystemCommandExecutors.go:78:3:78:56 | call to Command | SystemCommandExecutors.go:78:23:78:26 | "-t" |
| SystemCommandExecutors.go:78:3:78:56 | call to Command | SystemCommandExecutors.go:78:29:78:39 | "user@host" |
| SystemCommandExecutors.go:78:3:78:56 | call to Command | SystemCommandExecutors.go:78:42:78:55 | ...+... |
| SystemCommandExecutors.go:83:3:83:32 | call to CombinedOutput | SystemCommandExecutors.go:83:26:83:31 | source |
| SystemCommandExecutors.go:84:3:84:24 | call to Output | SystemCommandExecutors.go:84:18:84:23 | source |
| SystemCommandExecutors.go:85:3:85:21 | call to Run | SystemCommandExecutors.go:85:15:85:20 | source |
| SystemCommandExecutors.go:86:3:86:23 | call to Start | SystemCommandExecutors.go:86:17:86:22 | source |
| SystemCommandExecutors.go:90:3:90:86 | call to Command | SystemCommandExecutors.go:90:14:90:18 | shell |
| SystemCommandExecutors.go:90:3:90:86 | call to Command | SystemCommandExecutors.go:90:21:90:82 | call to toInterfaceArray |
| SystemCommandExecutors.go:91:3:91:104 | call to Call | SystemCommandExecutors.go:91:32:91:36 | shell |
| SystemCommandExecutors.go:91:3:91:104 | call to Call | SystemCommandExecutors.go:91:39:91:100 | call to toInterfaceArray |
| SystemCommandExecutors.go:92:3:92:107 | call to Command | SystemCommandExecutors.go:92:35:92:39 | shell |
| SystemCommandExecutors.go:92:3:92:107 | call to Command | SystemCommandExecutors.go:92:42:92:103 | call to toInterfaceArray |

101
ql/test/library-tests/semmle/go/frameworks/SystemCommandExecutors/SystemCommandExecutors.go Normal file
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@@ -0,0 +1,101 @@
package main
import (
"fmt"
"net/http"
"os"
"os/exec"
"github.com/codeskyblue/go-sh"
"golang.org/x/crypto/ssh"
)
func main() {}
func handler(w http.ResponseWriter, req *http.Request) {
sudo := "sudo"
shell := "/bin/bash"
assumedNonShell := "ls"
args := []string{}
source := req.URL.Query()["cmd"][0]
// os.StartProcess: these MUST be caught.
{
// `source` is used directly as command:
os.StartProcess(source, args, nil)
// `source` flows into a composite literal which is used
// as arguments, and the command is a shell:
os.StartProcess(shell, []string{source}, nil)
// `source` flows into a composite literal as first argument to append:
os.StartProcess(shell, append([]string{source}, args...), nil)
// `source` flows into a composite literal as Nth argument to append:
os.StartProcess(shell, append([]string{sudo}, source), nil)
}
// os.StartProcess: `source` MUST NOT be caught here because the first argument is not a ShellOrSudoExecution.
{
// `source` is an argument to a non-shell command that does not execute
// the `source` as a command, i.e. the source is just an argument to a command
// that will not execute it.
os.StartProcess(assumedNonShell, []string{source}, nil)
// as above, except the source is inside a composite literal inside an append:
os.StartProcess(assumedNonShell, append([]string{source}, args...), nil)
// source is used inside append as nth argument:
os.StartProcess(assumedNonShell, append([]string{assumedNonShell}, source), nil)
}
// exec.Command: these MUST be caught.
{
// source is used directly as command:
exec.Command(source, args...).Run()
// source comes as nth arg to a shell:
exec.Command(shell, "a0", "a1", source)
// source flows into a composite literal as Nth argument to append:
exec.Command(shell, append([]string{sudo}, source)...)
// other ways to compose a command:
exec.Command("sh", "-c", "GOOS=windows GOARCH=386 go build -ldflags \"-s -w -H=windowsgui\" -o \""+source+".go")
exec.Command("sudo", "sh", "-c", source)
// programming-language interpreters:
exec.Command("ruby", "-e", fmt.Sprintf(`system("ls %s")`, source))
exec.Command("perl", "-e", fmt.Sprintf(`system("sh sudo cp %s dst")`, source))
exec.Command("python2.7", "-c", fmt.Sprintf(`import os;os.system("ls %s")`, source))
exec.Command("python3.6m", "-c", fmt.Sprintf(`import os;os.system("ls %s")`, source))
// negative examples (args should not be caught):
exec.Command("python3.7-config", "--includes", source)
exec.Command("python3-pbr", "sha", source)
// ssh:
exec.Command("ssh", "-t", "user@host", "ping "+source)
}
// golang.org/x/crypto/ssh
{
session := &ssh.Session{}
session.CombinedOutput(source)
session.Output(source)
session.Run(source)
session.Start(source)
}
// github.com/codeskyblue/go-sh
{
sh.Command(shell, toInterfaceArray(append([]string{assumedNonShell}, source)...)...)
sh.InteractiveSession().Call(shell, toInterfaceArray(append([]string{assumedNonShell}, source)...)...)
sh.InteractiveSession().Command(shell, toInterfaceArray(append([]string{assumedNonShell}, source)...)...)
}
}
func toInterfaceArray(str ...string) []interface{} {
res := make([]interface{}, 0)
for i := range str {
res = append(res, str[i])
}
return res
}

5
ql/test/library-tests/semmle/go/frameworks/SystemCommandExecutors/SystemCommandExecutors.ql Normal file
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@@ -0,0 +1,5 @@
import go
import semmle.go.security.CommandInjection
from SystemCommandExecution exec
select exec, exec.getCommandName()

8
ql/test/library-tests/semmle/go/frameworks/SystemCommandExecutors/go.mod Normal file
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@@ -0,0 +1,8 @@
module github.com/gagliardetto/codeql-go/ql/test/library-tests/semmle/go/frameworks/SystemCommandExecutors
go 1.14
require (
github.com/codeskyblue/go-sh v0.0.0-20190412065543-76bd3d59ff27
golang.org/x/crypto v0.0.0-20200323165209-0ec3e9974c59
)

202
ql/test/library-tests/semmle/go/frameworks/SystemCommandExecutors/vendor/github.com/codeskyblue/go-sh/LICENSE generated vendored Normal file
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@@ -0,0 +1,202 @@
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distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

3
ql/test/library-tests/semmle/go/frameworks/SystemCommandExecutors/vendor/github.com/codeskyblue/go-sh/README.md generated vendored Normal file
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@@ -0,0 +1,3 @@
This is a simple stub for https://github.com/codeskyblue/go-sh, strictly for use in query testing.
See the LICENSE file in this folder for information about the licensing of the original library.

23
ql/test/library-tests/semmle/go/frameworks/SystemCommandExecutors/vendor/github.com/codeskyblue/go-sh/go-sh.go generated vendored Normal file
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@@ -0,0 +1,23 @@
package sh
type Session struct{}
func InteractiveSession() *Session {
return &Session{}
}
func Command(name string, a ...interface{}) *Session {
s := &Session{}
return s.Command(name, a...)
}
func (s *Session) Command(name string, a ...interface{}) *Session {
return s
}
// combine Command and Run
func (s *Session) Call(name string, a ...interface{}) error {
return s.Command(name, a...).Run()
}
func (s *Session) Run() (err error) {
return nil
}

1
ql/test/library-tests/semmle/go/frameworks/SystemCommandExecutors/vendor/github.com/codeskyblue/go-sh/go.mod generated vendored Normal file
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@@ -0,0 +1 @@
module github.com/codeskyblue/go-sh

27
ql/test/library-tests/semmle/go/frameworks/SystemCommandExecutors/vendor/golang.org/x/crypto/ssh/LICENSE generated vendored Normal file
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@@ -0,0 +1,27 @@
Copyright (c) 2009 The Go Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

3
ql/test/library-tests/semmle/go/frameworks/SystemCommandExecutors/vendor/golang.org/x/crypto/ssh/README.md generated vendored Normal file
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@@ -0,0 +1,3 @@
This is a simple stub for https://golang.org/x/crypto/ssh, strictly for use in query testing.
See the LICENSE file in this folder for information about the licensing of the original library.

1
ql/test/library-tests/semmle/go/frameworks/SystemCommandExecutors/vendor/golang.org/x/crypto/ssh/go.mod generated vendored Normal file
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module golang.org/x/crypto/ssh

16
ql/test/library-tests/semmle/go/frameworks/SystemCommandExecutors/vendor/golang.org/x/crypto/ssh/ssh.go generated vendored Normal file
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package ssh
type Session struct{}
func (s *Session) CombinedOutput(cmd string) ([]byte, error) {
return nil, nil
}
func (s *Session) Output(cmd string) ([]byte, error) {
return nil, nil
}
func (s *Session) Run(cmd string) error {
return nil
}
func (s *Session) Start(cmd string) error {
return nil
}

6
ql/test/library-tests/semmle/go/frameworks/SystemCommandExecutors/vendor/modules.txt vendored Normal file
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@@ -0,0 +1,6 @@
# github.com/codeskyblue/go-sh v0.0.0-20190412065543-76bd3d59ff27
## explicit
github.com/codeskyblue/go-sh
# golang.org/x/crypto v0.0.0-20200323165209-0ec3e9974c59
## explicit
golang.org/x/crypto/ssh